WRC AI 1.18 Vehicular Radar Glen Langston NSF Science with 4 mm Rx, Lines: Ø Dense gas tracers in star-‐forming regions and nearby galaxies (HCN, HNC, HCO+ all at ~90GHz) Ø D-‐species in cold cloud cores (~70-‐80GHz) Ø Astro/bio-‐chemistry (throughout the band) 4mm Rx: Cold starless-‐cores èmolecular freeze-‐ out èD-‐species enhanced N2D+ in L1544 at 77 GHz (S. Schnee et al.) N2H+ in W3OH at 93 GHz ITS Radiocommunication Services Spectrum VICS — Vehicle Information and Communications System 76-90MHz (FM multiplex broadcasting) ・ Traffic information 2.5GHz (Radio beacon) ・Collect highway toll (Communication) ETC -- Electronic Toll Collection DSRC -- Dedicated Short Range Communication Service 5.8 GHz/ 5.9 GHz ・Collect highway toll ・Provide various information (Communication, Broadcast) 24/26GHz Sub-millimeter, Millimeter wave system 60/76GHz ・Detect obstacles (Sensor) 79GHz Vehicle-to-Vehicle communications system Geneva, Switzerland, 27 June 2013 5.8GHz 700MHz ・Safety information (Communications) 4 WRC-‐15 Agenda Item 1.18 Title of the Agenda Item at the ITU World Radiocommunication Conference (WRC-‐2015): 1.18 to consider a primary allocation to the radiolocation service for automotive applications in the 77.5-‐78.0 GHz frequency band in accordance with Resolution 654 (WRC 12) Objective: " To fill a 500 MHz band in the 77.5 to 78 GHz band, in order to achieve global harmonization for ITS Collision Avoidance Radar operating in the 77 to 81 GHz band " To study other ITS safety-‐related applications that may benefit from global or regional harmonization 7 77-‐81 GHz Spectrum Allocation 75 76 77 78 79 80 81 GH RLS: Radio Location Service Additional Allocation: 77.5 – 78.0 GHz Proposed RLS: Radio Location Service 76 GHz Band Radar 79 GHz Band High-‐Resolution Radar Amateur and Amateur Satellite Service RAS: Radio Astronomy Service 8 Automotive Industry working to obtain all of 77-‐81 GHz band FCC reviews all public comments NTIA=Executive Commission=Congress It == Automotive Industry We == FCC Summary: Vehicular Radar May prevent Astronomical Observations in 76-‐81 GHz Astronomers must • Demonstrate value of range • Demonstrate adverse effects of existing systems • Show benefits of better sharing for other Services Attempts to protect 76-‐81 GHz for Astronomy have not been successful (In USA) Progress difficult unless Astronomers show benefits of protection for other services Alternate approach; Advocate all new systems must obey strong sharing principles: • No transmission when not in use • Adjust power for conditions • Include short no-‐transmission periods
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